Immunocompromised people may need fourth injection of Covid-19, CDC says
Research has shown that a booster dose improves the antibody response to the vaccine in some immunocompromised people.
Immunocompromised people who have received the Johnson & Johnson single dose vaccine should be boosted at least two months after their initial vaccine. People who choose a Moderna vaccine as a booster, even though they received a different vaccine as their first dose, should receive the half-dose-size vaccine that was cleared as a booster for the Moderna vaccine, the CDC said. .